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13. Rotate the capscrews evenly and progressively in rota-
tion to 60 ft. lbs. (81 Nm).
14. Insert plug into piston.
15. Remove the cylinder rod from the holding fixture.
16. Place T-seal, piston seal and wear rings in the outer pis-
ton diameter groove. (A tube, with I.D. slightly larger
than the O.D. of the piston is recommended to install the
solid seal).
WEAR
T-SEAL
RING
Figure 5-44. Piston Seal Kit Installation
17. Position the cylinder barrel in a suitable holding fixture.
3121160
SECTION 5 - BASIC HYDRAULIC INFORMATION AND SCHEMATICS
BACKUP
PISTON
SEAL
RING
WASHER
RING
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE CYLINDER ROD,
HEAD, AND PISTON. AVOID PULLING THE ROD OFF-CENTER, WHICH COULD
CAUSE DAMAGE TO THE PISTON AND CYLINDER BARREL SURFACES.
18. With barrel clamped securely, and while adequately sup-
porting the rod, insert the piston end into the barrel cyl-
inder. Ensure that the piston loading T-seal, piston seal
and wear ring are not damaged or dislodged.
19. Continue pushing the rod into the barrel until the cylin-
der head gland can be inserted into the barrel cylinder.
PISTON
ROD
BARREL
Figure 5-45. Rod Assembly Installation
20. Apply JLG Threadlocker (P/N 0100011) to the socket
head bolts and secure the cylinder head gland using the
washer ring and bolts. Torque bolts to 300 ft. lbs.
(406 Nm).
21. After the cylinder has been reassembled, the rod should
be pushed all the way in (fully retracted) prior to the
reinstallation of any holding valve or valves.
22. Install the counterbalance valve and fittings in the rod
port block, using new o-rings as applicable. Torque to
counterbalance valve as shown in Figure 5-35., Main
Boom Lift Cylinder.
SPACER
HEAD
WASHER RING
ROD
CA SCREW
5-25
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